I have a question concerning a gear issue on my 1967 johnson 33 hp super seahorse. When the prop blade is in line with the exhaust housing straight up and down, is it normal to not be able to move the shift lever into reverse? After moving the prop by hand to about the 1 or 2 oclock position it shifts easily but won't shift when prop is in the afore mentioned position. Is this common or is there a possible serious gear issue looming? Thanks for the response.